Infer MapReduce types where possible
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                 Key: MAPREDUCE-1411
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1411
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
          Components: client
            Reporter: Tom White
            Assignee: Tom White


Currently users must specify the output types of the map and reduce if they are 
different to the default (LongWritable keys, Text values). In many cases this 
information is available to the system from the user-supplied mapper and 
reducer, so it would be nice if the user didn't have to specify them in two 
places.

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